Improvement in millstone-balancing devices



UNITED STATESPATENT OFFICE.

JOHN P. MOORE, OF DE MOSSVILLE, KENTUCKY.

IMPROVEMENT IN MILLSTONE-BALANCING DEVICES.

Speciiieation forming part of Letters Patent No. 199,088, dated January8, 1878; application filed October 29, 1877.

To all "whom it may concern:

Be it known that I, J oHN P. MOORE, of De Mossville, in the county ofPendleton and .Y State of Kentucky, have invented a new and improvedMillstone-Balance; and I do hereby declare that the following is a full,clear, and exact description of the same, reference being had to theaccompanying drawings, forming part of this specification, in which-Figure 1 is a side view, showing the application of the device to a pairof millstones, indicated in dotted lines. Fig. 2 is an enlarged sideview, partly in section. Fig. 3 is a horizontal section through line xxof Fig. 2; Fig. 4, a detail of a modied form of nut.

The object of my invention is to provide an improved means of balancingmillstones to make them run true and grind uniformly, and which shallpermit an easy and accurate adjustment,`and dispense with weightsheretofore employed for the purpose.

The invention is an improvement upon that formof balance in which aremovable block is stepped upon the spindle, and is adjusted in anopening of the balance-rynd by horizontal set-screws, to balance themillstone by shifting its center.

The improvements consist, first, in using in the place of the block aheaded bolt, the head of which carries the weight of the millstone byresting against the under surface of the opening in the balance-rynd,and is itself supported upon the spindle, and employing, in connectionwith the threaded end of said bolt, a nut andwasher, which not onlyholds the bolt firmly in the balance-rynd, but also rests against theiiattened heads of the horizontal adjusting-screw, and acts as anut-lock to the same.

The invention also consists in forming such nut directly upon the bottompart of the distributing-cup, all as hereinafter more fully described.

` In the drawing, A represents, in dotted lines, the runner, and B thebed-stone, of any ordinary mill. O is the spindle, arranged in suitablebushings inthe bed-stone; D, the balancerynd affixed to the runner, andE the drivingiron, fastened rigidly upon the spindle, and arranged toengage with recesses in the imder .to rotate the stone.

Now, instead of allowing the upward bend of the balance-rynd to besupported directly upon the spindle, I form an opening or eye, a,through the balance-rynd, and place in the same a steel bolt, b, havinga head, c, and in the lower portion of said head I form an indentationto receive the spindle. This bolt I adjust in the opening of thebalance-rynd by four set-screws, d, so as to change the center of thestone with respect to the stationary bolt and spindle, in order tobalance the runner.

I am aware of the fact that it is not new to balance a millstone fromthe center upon the general principle of the employment of horizontaladjusting-screws and an independent block in the balance-rynd, the samebeing shown in the expired patent to J. H. Glover of December 1,1857 5but in this case the block has a horizontal groove inwhich theset-screws rest, and by which screws above it are supported. Thisarrangement not only brings the weight of the stone solely upon theset-screws, but, there being no locking device for the screws, they areforced out by the jar of the mill, so that they lose their adjustmentand drop in between the stones, producing serious damage.

To remedy these defects, in the first place I employ a headed steelbolt, b, instead of a grooved block, and arrange it so that the weightof the stone and the balance-rynd rests upon its head, while the latteris stepped directly upon the spindle. This, it will be seen, relievesthe horizontal adjusting-screws of the Weight of the millstone.

Furthermore, I form the heads of the adjusting-screws with lat orangular sides, and arrange a washer, f, and a cup-shaped nut, F, uponthe upper threaded end of bolt b, so that when screwed up they not onlyserve as a fastening for the bolt, but the lower edges of the widewasher t against the flat sides of the .heads of the adjusting-screws,and act as nutlocks to the same, to prevent them from ever turning orlosing their adjustment from the jar of the mill.

I. use an independent washer beneath the nut, instead of a ilange ofsimilar width formed upon the nut, so that the Washer may be placed uponthe set-screws, and the nut then turned Without abrading the set-screws,Which might loosen their adjustment. I may, however, if found desirablefor any reason, form the Washer and the nut of one and the same piece,as in Fig. 4.

The nut F, Imay also make plain, or in any other form, if desired; but Iprefer to make it cup-shaped, as in Fig. 2, for the'reason that itserves then as a distributing-cup to receive the grain and distribute itcircularly from centrifugal action, thus dispensing with the necessityof a separate distributing-cup, and combining tWo functions in onedevice.

To prevent the nut F from becoming loose Y and rising, I make the upperface of the balance-rynd dished, so that the Washer is supported only atits edges, and may spring slightly in the center, which permits the nutto be jamined'and held more securely.

In arranging the-thread of the bolt b and nut F the latter is designedto screw on in the reverse direction from the rotation of the millstone,so that the contact of anything against the cup when the stone isrunning will have a tendency to tighten instead of loosening the$211116.

Having thus described my invention, what I claim as new isl. The headedbolt b, in combination with the spindle, the adjusting-screws, theperforated balance-rynd, and the clamping-nut, arranged upon thethreaded stein of said bolt upon the opposite side of the balance-ryndfrom its head portion, substantially as and for the purpose described.

2. The combination, with the headed bolt b, the perforated balance-rynd,and the horizontal set-screws, having angular heads, of afastening-nutadapted to secure the bolt and lock the adjusting-screws,substantially as and for the purpose described.

3. The nut F, made-in cup shape, and cornbined with the bolt b, theperforated balancerynd, and the angular-headed horizontaladjusting-screws, as described.

J. I. MOORE.

Witnesses:

SoLoN O. KEMON, GHAs. A. Pn'r'rrr.

